Combined tube-mill and ball-mill.



L L. MUSHETT.

COMBINED TUBE MILL. AND BALL MILL.

APPLICATION FILED AUG-24. I9l6. v

Patented Nov. 13, 1917.

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Wl 7W E SSE S LEO L. MUSHETT, OIF MANHATTAN, NEVADA,

COMBINED vTUBE-lVIIl'JIl'l AND BALL-MILL.

Specification of Letters Patent.

Patented Nov. 13, 1917.

Application led August 24, 1916. Serial No. 116,587.

To all 'whom t may concern:

Be itknown that I, Lno L. MUsI-In'r'r, a citizenof the United States,and a resident of Manhattan, in the county of Nye and State ofNevadiuliave invented a new and Improved Combined Tube-Mill and Ball- YMill, of which the following is a full, clear,

and exact description.

My invention relates to a grinding mill of the general form of the tubemill but divided transversely into compartments, the rst of whichcontains heavy balls by which the rock is broken up, the material beingfed to the second compartment containing pebbles, or the like, forgrinding the broken material.V

My invention has particularly in view an improved means for separatingthe compartments of the mill and for feedingthe material from the firstcompartment to the `second compartment to be ground.

The invention also has in view a mill of the indicated character inwhich the axial feed passage through the head can be utilized as amanhole and the provision of a partition and feed means associatedtherewith, so constructed and arranged that it may be taken apart andremoved, or sections thereof renewed, the manhole feed passage servingfor the entrance and removal of the parts constituting the partition andfeed means.

The invention will be particularly explained in the specific descriptionfollowing.

Reference is to be had to the accompanying drawings forming a part ofthis specification in which similar reference characters indicatecorresponding parts in all the views.

Figure 1 is a longitudinal section taken centrally of the mill;

Fig. 2 is an enlarged face view o f the partition and feed means, partsbeing broken away;

Fig. 3 is a section on the line 3-3, Fig. 2;

Fig. l is a rear viewof the partition and feed means, parts being brokenaway and others in section.V

In carrying out my invention in practice, an elongated tube 10 isconstructed having the general character of tube mills and I divide thesame by a transverse partition, designated generally by the numeral 11.The tube is provided with heads 12, 13, of

any approved detail construction and driven, 1n practice, in anysuitable manner. The heads have trunnions formed with axial Yboresconstituting respectively the inlet and outlet for the material, theheads in practice, turning in suitable supports, (not shown).

The partition 11 divides the tube4 1() into a crushing compartment 14and agrinding compartment 15. The compartment 14 is equipped with asuitable number of large balls 16 which may take, generally, the form ofa cannon ball or otherwise as practice may dictate. In thecompartmentlis a quantity of pebbles 17 or equivalent reducing means asis customary in tube mills.

The object `of the arrangement as described is to cause the balls 16 tobreak up rocks fed thereto through the head 12 and to then transfer thebroken material through the partition 11 to the compartment 15.

The trunnion of the head 12 is fitted with a spiral feed tube 18 orother feed means to conduct material to the trunnion. The bore of thetrunnionis of such a size that it may be utilized as a manhole for theentrance of a workman and for the entrance andremoval of the elementsmaking up the partition 11 and its appurtenances.

.The partition 11 includes radial spokes, here shown as four in number,two being designated by the numeral 19, a third by the numeral 19a, anda fourth by the numeral 19h. The inner ends of the spokes constitutehub` sections and are formed with radial flanges 20, the adjacentflanges of the respective sections being suitably bolted .together. Thefront of the partition is in the form of a screen to permit the materialbroken up in the chamber 1li to pass into the partition. rlhe front ismade up of sections suiiiciently small to be passed through the head 12for which purpose a central disk 21 may be utilized, about which isplaced segmental plates 22 perforated to constitute a screen. The Vrearof the partition 11 may, similarly, be formed of a central flat ring 23and sectors 24.

The front and back of the partition 11 are spaced by the spokes so thatthe partition'is hollow to receive the material passing through thescreen plate sectors 22. Within the partition a spiral feed device isformed to take up the material at the periphery of the partition anddischarge it to the hollow center of the partition and to thecompartment 15. The spiral feed device is made up of spiral pipesections between the respective spokes, the spokes having openingsconstituting part of the spiral passage. Three of the spokes havetransverse openings 19` having spiral relation. The spiral pipe sections25, 25EL are secured between adjacent spokes to communicate with thesaid openings 19C. A third spiral pipe section 25b receives at one endthe material from the adjacent opening 19C and communicates with anopening 19d in the next spoke 19a, said opening 19d being directedinwardly and communicating with the hollow center 26 formed by the hubsections of the respective spokes. The inlet to the hollow center 26 maybe partially formed by a recess 19e in the adjacent spoke 19b so thatthe two spokes 19a, 19h, form jointly the inner terminal of the spiralfeed passage.

The disk 2l and the ring 23 may be made 1n sections to insure theirready entrance and removal through the head l2 without forming the borethereof unduly large. Any suitable means may be formed to unite thedifferent elements; the spiral pipe sections 25, etc., are shown ashaving flanges 27 for'receiving screws 28 or the like taking into thespokes 19, etc. Screws 29 are shown in the present example for securingthe elements 21, 22, 23 and 211C to the spokes. The numeral 30 indicatesthe central opening in the ring 23 for the discharge of the materialfrom the hollow center 26 to the compartment 15.

By the described arrangement effective ready delivery of the crushedmaterial fromthe compartment 14 to the'compartment 15 is obtained, theconstruction insuring that only such material enters the compartment 15as may be eifectively taken care of by the grinding means therein.

The described construction affords practical means for carrying myinvention into effect and I will state in conclusion that 1 do not limitmyself strictly to the mechanical details herein illustrated, sincemanifestly the same can be considerably varied without departure fromthe spirit of the invention as defined in the appended claims.

In the operation of the apparatus constructed as above described,different levels of the material are maintained in the two compartments,the respective levels making for effectiveness in the ball compartmentand in the pebble compartment, the material in each compartment beingmaintained at a level suitable for the crushing and reducc ing elementsto which the material is subjected in the respective mills. l I Havingthus described my invention 1 claim as new, and desire to ters Patent:

l. A mill of the class described including a tube having an inlet at oneend and an outlet at the opposite end, a transverse partition in saidtube dividing the same into compartments, crushing elements in the firstcompartment to break up the rock, reducing elements in the secondcompartment to grind the crushed material, and a spiral feed device inthe partition, said partition having sectional front and back plates,and spokes between said plates and formed with detachably connectedhubsections, the said feed device comprising spiral pipe sectionsdetachably connected with the spokes, and said spokes having openingscomplementary to the spiral pipe sections, the partition having a hollowcenter receiving the material from the feed device and having a lateraloutlet therefrom to the second compartment.

2. A mill of the class described including a tube having an inlet at oneend and an outlet at the opposite end, a transverse partition insaidtube dividing the same into compartments, crushing elements in the firstcompartment to break up the rock, reducing elements in the secondcompartment to grind the crushed material, and a spiral feed device inthe partition, said partition having a front formed of .a centralimperforate plate and a screen radially outward from the imperforateplate and formed in sectors, the rear face of the partition being formedin sections and presenting an open center leading to the secondcompartment, there being secure by Letseparate radial spokes disposedbetween the plates, the spokes having hub sections de-Y tachably unitedand forming a hollow center in the partition and communicating `with theopen center of the rear plate, said feed device yincluding spiral pipesections between the spokes and said spokes having openingscomplementary to the pipe sections, said feed device furthermore havingan inlet adjacent to the periphery of the partition and discharging atits inner end to the said hollow center of the partition.

3. A mill of the class described including a tube having an inlet at oneend and an outlet at the opposite end, a transverse partition in saidtube dividing the same into compartments, crushing elements in the firstv to receive at one end material to be reduced openings complementary tothe pipe secand means at theropposite end of the chamtions and formingtherewith a spiral feed ber to eiect discharge of the material by deviceadapted to receive the reduced ma- 10 the rotation of the mill, the saidmeans comterial from the said chamber t0 discharge 5 prising spokes inthe said opposite end, and the same.

spiral pipe sections disposed between the spokes, the said spokes havingtransverse LEO L. MUSHETT.

Copies of this patent may be obtained for ve cents eachLby addressingthe Commissioner of Eatents. Washington, D. C.

